Dudley Salmon from the Bureau of Alcohol, Tobacco, Firearms and Explosives unit, or ATF, shows students in the IUPD cadet program the damage done to a coffee can after a blasting cap was detonated Wednesday at the IU cross country course. Officers from the ATF and the Indiana State Police bomb squad gave an explosives demonstration to the cadets that are currently enrolled in the Office Program. The explosives demonstration started small with the blasting cap in the coffee can. Courtney Deckard